The Kiehl's anti-aging bestseller is back with an even more effective vitamin C and hyaluronic acid formula that immediately and sustainably reduces lines and wrinkles while also giving the skin a natural radiance. More than ten years ago, the Powerful Strength Line Reducing Concentrate Serum was a milestone in the formulation of anti-aging products with 10.5% pure vitamin C concentrate. After years of research and the latest dermatological findings, Kiehl's was able to achieve another innovation by expanding the formula to 12.5% pure vitamin C concentrate. The latest, groundbreaking formula therefore consists of 10.5% pure vitamin C, which promotes collagen production in the skin and thus sustainably supports the skin's elasticity. A further 2% vitamin Cg (ascorbyl glucoside) was added to the formula to actively promote the evenness and radiance of the skin in the long term. To further reduce the appearance of wrinkles, the formula of the new Powerful Strength Line Reducing Concentrate is also based on hyaluronic acid. Hyaluronic acid has the ability to bind large amounts of water and thus guarantee the skin's moisture supply. This extra moisture boost plumps up wrinkles for the long term and gives the skin a visibly smoother surface. The new, adapted formula is rounded off by an even longer shelf life and correspondingly greater efficiency, and gives the skin a warming effect when applied for real moments of well-being. The new formula also impresses with a fresh citrus aroma.